When the two men appeared together Saturday afternoon, Sen. Obamaexplained his choice by invoking the talking points that Sen.Biden's allies had pushed during the vetting process. "Joe Biden isthat rare mix," Sen. Obama told the crowd. "For decades, he hasbrought change to Washington, but Washington hasn't changed him."

Republicans now are quickly trying to tear that logic apart.They're painting Sen. Biden as an old-style insider, with longstanding ties to trial lawyers and lobbyists and a taste forpork-barrel spending, which their nominee, Sen. John McCain, hasopposed.

The pairing of the two Democratic senators against Sen. McCaincarries some ironies. Sens. Biden and Obama rarely have crossedpaths in the Senate, aside from Sen. Obama's presence on theForeign Relations Committee, where Sen. Biden is chairman. Sens.Biden and McCain have worked frequently together, and have muchmore in common.

Each is a foreign-policy heavyweight in the Senate and has shown aspecial interest in Eastern European affairs. In 2005, the pairworked together on behalf of Kyrgyzstan and Moldova, according toMcCain Senate records. Sen. McCain and Sen. Biden were co-authorsof the McCain-Biden Kosovo Resolution in 1999 that would haveauthorized President Bill Clinton to use "all necessary force" toresolve the conflict.

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